You've moved to the city to take your entrance exams. Your relatives' house is your temporary home, but it's inhabited by four sisters who are overly serious and determined to support your studies—by any means necessary. If you're cold, they'll warm you up with their naked bodies. They'll join you in the bath to wash you clean. To help you concentrate, they'll collect every drop of your semen. Their extreme methods of encouragement might just be the key to your success.